Prime Checkerboard Grid
This program prints a checkerboard of prime and non-prime indicators.
Problem Statement
Write a Java program that prints a 4x4 checkerboard grid where prime numbers are marked as 1 and non-primes as 0.
Source Code
| 1 | public class PrimeCheckerboard { |
| 2 | public static void main(String[] args) { |
| 3 | int num = 2; |
| 4 | for(int i=0; i<4; i++) { |
| 5 | for(int j=0; j<4; j++) { |
| 6 | boolean prime = true; |
| 7 | for(int k=2; k<=num/2; k++) { |
| 8 | if(num % k == 0) { |
| 9 | prime = false; |
| 10 | break; |
| 11 | } |
| 12 | } |
| 13 | System.out.print((prime ? "1 " : "0 ")); |
| 14 | num++; |
| 15 | } |
| 16 | System.out.println(); |
| 17 | } |
| 18 | } |
| 19 | } |
Program Output
1 1 1 0 1 0 1 0 1 0 0 1 0 1 0 0
Explanation
Each number is checked for primality. If prime, print 1; else 0. Nested loops arrange results in checkerboard form. Shows how nested loops can generate prime checkerboards.